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Repository search functionality (WebUI)

The ability to search a repository from the webui would be very useful. I have a few senior developers who will assist our fresh staff on issues via mobile or computer without a git client. Our prior git hosting had a repository search functionality baked into the webui which allowed to to more easily provide feedback on specific code issues.

Example, would be if a dev wants to search the entire branch for `Handle_OP_CreateObject` it would search and return each hit with 5-10 lines of code prior and post to the entry. Gitlab/Github have a similar feature via their WebUI.